@article{MM2_1976__19_154404,
     author = {Walter Tholen and R. B\"orger},
     title = {Abschw\"achungen des {Adjunktionsbegriffs.}},
     journal = {Manuscripta mathematica},
     pages = {19--46},
     publisher = {mathdoc},
     volume = {19},
     year = {1976},
     zbl = {0329.18005},
     url = {http://geodesic.mathdoc.fr/item/MM2_1976__19_154404/}
}